Hydraulic impeller or pump



C. E. TALLIS HYDRAULIC IMPELLER OR PUMP Feb. 16, 1954 2 Sheets-Sheet 1 Original .Filed Aug. 20, 1951 FIGA.

1 1954 c. E. TALLls 7 HYDRAULIC IMPELLER OR PUMP Original Filed Aug 20, 1951 2 Sheets-Sheet 2 FIG.3..

Patented Feb. 16, 1954 HYDRAULIC IMPELLER R PUMP Gharles Edward Tallis, Handsworth, Birmingham, England, assignor to Birmingham Tool & Gauge Company Limited, Handsworth, England Qriginal application August 20, 1951, .Serial No. 242,763. Divided and this application March 6, 1953, Serial No. 340,804

fifllaims. (Cl. 103--38) This application is a division of my application Serial No. 242,763 filed August 20, 1951, now Patent No. 2,657,046. "for Automatic Feed Mechanism for PowerPresses and Like Machines, and comprises improvements in or relating to hydraulic impellers or pumps and has for its object to provide such-an impeller or pump in which a sufiicientvolume oi fluid is displaced in one revolution thereof to efiect a controlled movement on an associated hydraulic linkage coupled thereto, whilst at the same time on each revolution of the pump an over induction of fluid in an associated hydraulic linkage is effected half way through its cycle and compressed at the completion of the cycle.

Referring to the accompanying drawings- Figure 1 is a cross sectional elevation of a pump or impeller according to the present invention.

Figure 2 is a view taken on the line 'H--'ll of Figure 1, i. .e. an end view of the impeller with the cover removed.

Figure .3 is a view of the other end of the impeller, and v Ii'igure 4 is .a detail sectional view on .an en largedlscale of onset the impeller plungers showing the automatic replenishing valve mechanism therein.

In carrying the present invention into practice as shown .upon the accompanying drawings, the impeller comprises two pairs of ,plungers 60;, .60 andilfil fil operating in bushes B2 in the wall63 ofLthe impeller housing, the pair of .plungers :60, 60 which operate together entera chamber 64 communicating with-the pipe .16, Whilst inasimilar manner the pair of -plungers 76!, 6| enter a chamber SS-communicating with the pipe t1, the ends .of the plungers remote from .said chamber areeach provided with rollers .66 ion-contact with pivoted members .61, [iii whicharepivotedto support .members .or blocks .69, 10. .These pivoted members 61,, 68' each carry universally pivoted thereon shoes H bearing against the .face of a swash plate or face cam. .12 rotatably mounted in. the cover 13 of the impeller housing and driven in any suitable manner.

The .blocks .69, L0 have a screw .threadedengagement with the threaded portions J4, 15 of the vertical. shaft 16 rotatably mounted in the impeller housing and having secured to its upper endtthecontr-olknob 20. The threaded portions 14, 15 of this shaft .are of oppositehand so that on rotation of'the shaft the blocks 69, 10 are either: tmoved apart or towards one another. Thusby manipulating the knob 20 the shoes l l are either moved towards the centre of the race cam 2 to reduce the stroke ofthe plunger-s60, ill andli l 6! :so that theminimum of oil-movement takes-place along the :pipes l 6, l1 or said shoes 3H may be-adjusted towards the periphery the -cam or swash plate lz to-obtain maximum 2 stroke of the plungers and consequent maximum movement of fluid along the pipes l6, l! to operate an associated hydraulic linkage.

The ends of the plungers 60, 66, t], M within the chambers 64, respectively are bored at r'l (Figure 4) to receive compression springs it for abutment therein, the outer ends of the springs 18 abutting the wall 63 of the impeller housing in order to maintain the rollers 66 at the other ends of the pistons in contact with the pivoted members 61, 68.

The housing of the pump containing the swash plate 12 and associated mechanism serves as a reservoir for oil at atmospheric pressure for the purpose of replenishing the two lines of oil under pressure between the impeller and an associated hydraulic linkage, in order to make good any loss. For this purpose communication is effected between the housing of the pump and the chambers 64, 65 by means of automatic valves contained inat least one plunger 89 or iii of each pair.

The automatic valve of one of the plungers Bil is shown in Figure 4 from which it will be seen that the roller 66 is carried by a forked head 86 having a shank 8! fitting in a bore'82 in the other end of the plunger Gil, said shank having an axial through bore 8t therein.

Located inthe boreilZ for limited sliding movement between the inner end-of the shank 8i and the annular shoulder 84 inthe plunger so is a valve member 85' the fulLdiameter portion 860i which is an-oil tight sliding fit in the bore '82 and when in the position showncloses the inner end of the-berets in the shank 8 from the bore 17 and hence "from communication with the sham-.- ber 64, the valve member:85 being urged to this position by pressure of oil thereon from said chamber.

However, upon a tall in oil pressure in the chamber and as thezpiston-fill eiiects anoutward suction stroke therein :the suction on the valve-member '85 .moves it towards and against the annularishoulder fidenabling oil to be in.- ducted from :the impeller housing through the bore;8-3 in the shankzd'l and via the reducedpor tion 810f the valve :member 85 (which then reg.- isters .with-theannular groove 88 in the plunger.) to the bored I and :from .wthenceinto the chamber 64.

Inductance of oil through the above described automatic non-returnval-vein' the plunger 6.0 is promoted "by virtue of theifact thatdues-to the action of the swash plate 1? the :plungers so, so, 6|, 6! arenot reciprocate'd at aconstant speed. Thus after a quarter of 217116 way-throughafeeds ing cycle when the swash plate has rotated through 90 the plungers i 6l advancingintothe chamber -63 to impel oil along the pipe I l to an associated hydraulic' linkage, but the plunger -69 receding from the chamber 64 to assist and accommodate return movement of oil from the pipe 16 have a slightly greater extent of movement creating a partial vacuum in the chamber 84 to assist inductance of oil through the plunger 60 that is fitted with the automatic valve.

Halfway through the cycle the extent of movement of the plungers 60, 60 equals that of the plungers 6|, 6! and three-quarters of the way through the cycle a similar accelerated movement of the plungers 6|, 6| receding from the chamber 65 takes place to create a partial vacuum in the latter for promoting the desired oil inductance through an automatic valve in one of the plungers 6| identical with that described and shown in one of the plungers 60.

The arrangement of the annular groove 88 in relation to the reduced portion 81 of the valve member 85 is such that the passage of oil is only permitted when the valve member is fully against the shoulder 84 otherwise too great a quantity of oil would tend to be inducted through the plunger.

I claim:

1. A hydraulic impeller or pump comprising a body part; a swash plate rotatably mounted for driven rotation in said body part; at least one movable support member carried by said body part and adjustable radially with respect to the swash plate; at least one member pivoted to said support member and extending adjacent the face of said swash plate; a shoe carried by said pivoted member and bearing against the face of said swash plate; at least one hydraulic fluid chamber provided on said body part; and at least one plunger having one end slidable in said chamber whilst the other end abuts said pivoted member, the arrangement being that on adjustment of said support member the shoe of the pivoted member is moved relative to the axis of the swash plate thus varying the degree of pivotal movement of the pivoted member and the point of abutment therewith of the plunger with consequent variation in stroke of the latter.

2. A hydraulic impeller or pump comprising a casing; a swash plate rotatably mounted in said casing; at least one movable support member carried by said casing; screw means carried by said casing and arranged to act on said support member for adjusting the latter radially with respect to the swash plate; at least one member pivoted to said support member and extending adjacent the face of said swash plate; a shoe carried by said pivoted member and bearing against the face of said swash plate; at least one hydraulic fluid chamber provided on said casing; and at least one plunger having one end slidable in said chamber whilst the other end abuts said pivoted member, the arrangement being that on adjustment of said support member the shoe of the pivoted member is moved relative to the axis of the swash plate thus varying the degree of pivotal movement of the pivoted member and the point of abutment therewith of the plunger with consequent variation in stroke of the latter.

3. A hydraulic impeller or pump according to claim 2 wherein the casing of the impeller is adapted to serve as a reservoir for hydraulic fluid whilst at least one plunger to the hydraulic fluid chamber is provided with a bore containing an automatic non-return valve for effecting inductance of fluid from the casing to the chamber in order to replenish the latter on a fall in hydraulic fluid pressure therein due to fluid loss.

4. A hydraulic impeller or pump according to claim 3 wherein the automatic non-return valve comprises a valve member having limited movement in a bore in the plunger and adapted to be normally urged by pressure of fluid from the chamber to a position in said bore to prevent passage of fluid therethrough but adapted on a fall in fluid pressure in said chamber to move to a position to permit inductance of fluid through the bore in said plunger into the chamber.

5. A hydraulic impeller or pump comprising a casing; a swash plate mounted for driven rotation in said casing; a shaft rotatably mounted in said casing and disposed at right angles to the axis of said swash plate and having two threaded portions thereon of opposite hand to one another;

a pair of support members threaded one each on.

said threaded portions of said shaft so that on rotation of the latter they move towards or away from one another and the axis of said swash plate; a pair of members pivoted one each to said support members and both extending adjacent the face of said swash plate; a pair of shoes carried one each by said pivoted members and bearing against the face of said swash plate; a pair of hydraulic fluid chambers mounted on said casing,'and adapted to be connected one each to the two hydraulic fluid lines; at least one pair of plungers having corresponding ends slidable one each in said chambers whilst the other ends of said plungers abut one each against said pivoted members so that the plungers are arranged to reciprocate in opposite directions, the arrangement being that on rotation of the shaft the support members are moved to in turn adjust the position of the shoes of the pivoted members against the face of the swash plate relative to the axis of the latter thus varying the degree of pivotal movement of the pivoted members and the points of abutment therewith of their corresponding plungers with consequent variation in the stroke of the latter.

6. A hydraulic impeller or pump according to claim 5 wherein the casing of the impeller is adapted to serve as a reservoir for hydraulic fluid whilst at least one plunger to each hydraulic fluid chamber is provided with a bore containing an automatic non-return valve for effecting inductance of fluid from the casing to the chambers in order to replenish the latter on a fall in hydraulic fluid pressure therein due to fluid loss, the arrangement being that the swash plate is adapted to actuate the plungers through the pivoted members so that the reciprocating movement of the plungers is not at a constant speed to one another so that at stages during he reciprocatory cycle one plunger recedes from its chamber to a greater extent than the entering movement of the other plunger into its chamber in order to create a condition of partial vacuum in that chamber from which the plunger is receding to promote fluid inductance past the automatic valve in said plunger.

CHARLES EDWARD TALLIS.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,922,539 Groff Aug. 15, 1933 1,930,297 Welch Oct. 10, 1933 2,069,651 Ferris Feb. 2, 1937 2,183,436 Towler Dec. 12, 1939 2,357,563 Truxell Sept. 5, 1944 2,457,339 Bertea Dec. 28, 1948 2,471,195 Christopher May 24, 1949 

